Kavli Affiliate: Viatcheslav V. Dobrovitski
| First 5 Authors: [#item_custom_name[1]], [#item_custom_name[2]], [#item_custom_name[3]], [#item_custom_name[4]], [#item_custom_name[5]]
| Summary:
Shuttling of spin qubits between different locations is a key element in many
prospective semiconductor systems for quantum information processing, but the
shuttled qubits should be protected from decoherence created by time- and
space-dependent noises. Since the paths of different spin qubits are
interrelated, the noises acting on the shuttled spins exhibit complex and
unusual correlations. We appraise the role of these correlations using the
concept of trajectories on random sheets, and demonstrate that they can
drastically affect efficiency of the coherence protection. These correlations
can also be exploited to enhance the shuttling fidelity, and we show that by
encoding logical qubit in a state of two consequtively shuttled entangled
spins, high fidelity can be achieved even for very slow shuttling. We identify
the conditions favoring this encoding, and quantify improvement in the
shuttling fidelity in comparison with the single-spin shuttling.
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